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COMBINATION ELECTRONIC AND AIR-COLUMN ACTUATED STETHOSCOPE
US 3,539,724 A
Filed
: 07/03/1967
Issued
: 11/10/1970
Est. Priority Date
: 07/03/1967
Status: Expired due to Term
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Current Assignee
Daniel C. Keesee
Original Assignee
Daniel C. Keesee
Inventors
Keesee, Daniel C.
Application Number
US04/654,312
Time in Patent Office
1,226 Days
Field of Search
US Class Current
381/67
CPC Class Codes
A61B 7/02
Stethoscopes acoustic detai...
H03F 3/183
with semiconductor devices ...
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